From dimviii's photo it's clearly too deep cut. No accidental hit of a stone but a concrete bridge like I think Bluuford said.
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Any idea what material is it with such white color? Some sort of cast white iron?
This type i guess, pretty sure they will homologate a new part for next year. Haven't they had the hub break at the top bolt of the damper twice and Neuville in MC was maybe something with the hub?
"White cast iron
When the white cast iron is fractured, white coloured cracks are seen throughout because of the presence of carbide impurities. White cast iron is hard but brittle. It has lower silicon content and low melting point. The carbon present in the white cast iron precipitates and forms large particles that increase the hardness of the cast iron. It is abrasive resistant as well as cost-effective making them useful in various applications like lifter bars and shell liners in grinding mills, wear surfaces of pumps, balls and rings of coal pulverisers, etc."
some kind of aluminium not iron.
The hubs are either forged aluminum or machined
White cast iron is used of cooking ware. Like pots and pans :). Not the best for suspension components of race cars.
I thought as well but none of aluminium parts I have on my table is so white inside (I admit I don't have anything forged here only die casted and machined parts and moreover not suspension ones). Maybe some alloy is so white.
Maybe I used wrong English equivalent but what we call white iron in Czech (bílá litina) is actually used in automotive. I can see it's properly called whiteheart malleable cast iron or GJMW in EN code.